From e1366f02fea3cb035cc4ed0b59d12f1962b6ebfd Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Sat, 13 Sep 2014 14:48:37 -0500 Subject: Bug report from luckboy: rm -f on a broken symlink didn't work because our "does it exist" test (to avoid errors on rm -f of nonexistent files) said it didn't. The fix: replace the access() with unlink(), which produces the same "does not exist" errno and has the added bonus of acting as a fastpath for rm -f on non-directories. (And since it produces a different error on directories, falls through to the old behavior there.) Most of this commit is comment updates explaining being subtle. :) --- toys/posix/rm.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'toys') diff --git a/toys/posix/rm.c b/toys/posix/rm.c index 2f40106f..6c984046 100644 --- a/toys/posix/rm.c +++ b/toys/posix/rm.c @@ -88,11 +88,15 @@ void rm_main(void) continue; } - // There's a race here where a file removed between this access and + // Files that already don't exist aren't errors for -f, so try a quick + // unlink now to see if it succeeds or reports that it didn't exist. + if ((toys.optflags & FLAG_f) && (!unlink(*s) || errno == ENOENT)) + continue; + + // There's a race here where a file removed between the above check and // dirtree's stat would report the nonexistence as an error, but that's // not a normal "it didn't exist" so I'm ok with it. - if ((toys.optflags & FLAG_f) && (access(*s, F_OK) && errno == ENOENT)) - continue; + dirtree_read(*s, do_rm); } } -- cgit v1.2.3